Pengaruh Cu-Sn Heat Exchanger Shell and Tube terhadap Tekanan Uap pada Pembangkit Listrik Tenaga Konversi Energi Panas Laut (OTEC)

Abstract

The OTEC case study with a plate heat exchanger measuring 50 mm wide x 1500 mm long titanium material previously managed to show its excellent corrosion resistance performance with an overall heat transfer coefficient of 20% higher than normal surface sheet, but the cost and availability of this material outweighs the benefits offered, gained from lifetime operation. The plate type heat exchanger is physically thin, very hard and inflexible, so it is susceptible to effects such as turbulence and friction and abrasives due to mechanical factors. OTEC research as an alternative uses Cu-Sn heat exchanger material with a shell and tube type that is thick and resistant to extreme weather effects and chemical factors. The purpose of this research was to build a new model of Cu-Sn Heat exchanger Shell and Tube in the OTEC system through Aspen and CFD BEM and BJM type simulations where the observed parameter values were temperature, pressure, mass flow rate and working performance. Then, Building a Shell and Tube OTEC Cu-Sn Heat exchanger Prototype in a 1:6 Scale Model (scale down) measuring 60 mm wide x long. The simulation results carried out by Aspen Plus and Ansys CFD in a closed cycle OTEC on the new model Cu-Sn Heat exchanger Shell and Tube OTEC are very effective on the BEM type, it is recommended that laboratory scale prototypes be made, which are the results of comparisons with the BJM type. Where laminar flow maintains the temperature of the working fluid, compared to the flow in the BJM type heat exchanger. Average capacity: Q = 166,248 J/s = 166,248 watts, and the results of the calculation of the hot water test in the average capacity condenser: Q = 374.5 J/s = 374.5 watts. Overall heat transfer coefficient (U) for Evaporator 523 W/m2 0C Overall heat transfer coefficient (U) for Condenser 524 W/m2 0C and Mass flow rate of hot water (ṁ) = 0.114 kg⁄s.